#(\w+)表1至多个，(\w*)表0至多个
#(?P<p1>\w+)表 w+ 代表的字符 的名字为p1
(r‘/nsn/(\w+)/(\w+)/(\w+)‘, index.NsnHandler)

from  tornado.web import RequestHandler
class NsnHandler(RequestHandler):
    def get(self,u1,u2,u3):
        print(u1+"-"+u2+"-"+u3)
        self.write("u123")